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The only major difference between the 601 and 602 is the switch from the original four grooves, right-hand 1:14-inch (1:355.6 mm or 64 calibers) rifling twist rate to the more common four grooves, right-hand 1:12-inch (1:304.8 mm or 54.8 calibers) twist. This was done as the original 1:14-inch twist rate to just stabilize the 55 grain bullet ...
Eugene Morrison Stoner (November 22, 1922 – April 24, 1997) was an American machinist and firearms designer who is most associated with the development of the ArmaLite AR-15 rifle that was redesigned and modified by Colt's Patent Firearm Company for the United States military as the M16 rifle.
[73] [74] The military M4 carbine typically uses a 14.5-inch (37 cm) barrel. Civilian rifles commonly have 16-inch (41 cm) or longer barrels to comply with the National Firearms Act. [75] To prevent a civilian semi-automatic AR-15 from being readily converted for use with the select fire components, several features were changed.
The early commercial SP-1 AR-15s used a pair of 0.250-inch (6.4 mm) diameter receiver push pins, identical to those found on the military rifles. In 1966 the company replaced the front pin with a paired nut and screw hinge using a 0.315-inch-diameter (8.0 mm) pin to prevent shooters from being able to change receivers with military rifles or ...
11.5 in. A1 1:12 No 4.5" Moderator or A1 639 Colt SMG: 2nd Short Ribbed S-1-3 A1 No Yes 9mm NATO 10 in. A1 w/ integral silencer: 1:10 No A2 Compensator 640: XM177 Commando: 2nd Generation Short Ribbed S-1-F A1 No No .223 REM 11.5 in. A1 1:12 No 4.5" Moderator or A1 645: M16A1E1: A1 Ribbed S-1-3 A2 Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A2 ...
5.56×45mm NATO: Howa Machinery Company, Sterling Armaments Company: Semi-automatic rifle version of the AR-18. AR-100 AR-101 AR-102 AR-103 AR-104: 5.56×45mm NATO: ArmaLite, Elitool: AR-100 series [4] based on the AR-16 that used a self ejecting magazine device. [5] Used in development of Ultimax 100 LMG. AR-30, AR-30A1, AR-31
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.
The Barrett REC7 (designation stands for "reliability-enhanced carbine") [1] is an American firearm manufactured as a selective-fire fully-automatic and semi-automatic rifle by Barrett Firearms. It is an M4 carbine utilizing a short-stroke gas piston system and is available in either 5.56×45mm NATO or 6.8mm Remington SPC .